When a user double-clicks on a drive letter, user gets a program list screen, asking which program to open the drive with or receives the following: Windows cannot find 'AcaRmoNa.ExE'

1. Open My Computer. 
2. Click on Tools>Folder Options. 
3. Check 'Show Hidden Files & Folders' and uncheck 'Hide protected operating system files'. 
4. Go to the root of the drive (example, C:\ ) in Explorer and delete the file autorun.inf if it exists. 
5. Do the same with all the drives exhibiting the same problem and reboot.
   
   If this doesn't fix it, or if you didn't find any autorun.inf file: 
6. Select Start>Run. 
7. Type regedit and hit enter. 
8. Navigate to the following key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2 
9. Expand the key. You should see various folders/keys with the drive names (C,D,E,F etc.) 
10. Make sure that the folders corresponding with the drive names do not have any sub-folders (visible when you click on the '+' sign next to the folder in the left pane) named '_Autoplay' and 'Shell'. 
11. If you see them, highlight them with a single-click and hit delete. 
12. Reboot.